Hydrogen was an element that formed the base material for nearly all stars within the galaxy. Hydrogen was the lightest chemical element known to the Lost Tribe of Sith on the planetKesh.[1] Hydrogen and another element called oxygen formed a substance called water when chemically combined. When a star ceased burning its hydrogen supply into helium, it would then begin to burn heavier elements before ending in a supernova or diminishing into a white dwarf. According to Corran Horn, it was one of the most common things in existence, followed closely by stupidity and TIE Fighter ball cockpits.